This wreath uses an Arduino microcontroller with the Adafruit MP3 shield and a Parallax PIR motion sensor to detect if someone is approaching the doorway. It then plays a custom greeting pre-recorded and pitched to sound like an Elf, after which it plays a random Christmas Song. The song(s) will k...By: asquared
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from Instructables: exploring - technology http://www.instructables.com/id/Christmas-Greeting-Wreath-Arduino-and-MP3/
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